Drill cultivator



Feb. 6, 1940. F. THOMPSON DRILL CULTIVATOR Filed Aug. 17, 1938 3 Sheets-Sheet 1 11222622250? FTbompson f5 fidi" J 3 Sheets-Sheet 2 F. THOMPSON DRILL CULTIVATOR Filed Aug. 17, 1938 Feb. 6, 1940.

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- lizventaz" FThoz z vson Feb. 6, 1940. THOMPSON 2,189,185

DRILL CULTIVA'IOR Filed Aug. 17, 1938 5 Sheets-Sheet 3 58 .lL E. [1H "/'-J M ml I9 n /g /9 3% 8 w W .W N

Inventor I 6/ FT or son Patented Feb. 6 1940 Frank Thompson, Hamilton, Ontario, Canada, as-

signor to International Harvester Company, a

corporation of New Jersey Application August 17, 1938', Serial'No. 22 5,3 22

2Claims. H (01. 97-244) This invention relates to a drill cultivator.

More specifically it relates to a cultivator that is provided with a frame carrying cultivating elements and connections for parallel lifting of the frame and for lifting it to a predetermined eletion that either spring tooth elements or stumpjump elements'may be mounted upon it.

a T An objectof the present invention is the provision of an improved drill cultivator.v

Afurther. object of the invention is to provide a drill cultivator in which there is a parallel lifting of the cultivator elements to a predeter- "ered positions-p mined-height fromany one of a plurality of low- Another object of the invention is the provision of a frame" of a drill cultivator, upon which maybe mounted either spring tooth elements or stumpejump elements.

Still another object of the invention is the provision ofa cultivator which embodies both of the aforementioned improvements, namely, the parallel lifting of cultivating elements to a fixed height, and the mounting of either spring tooth elements or stump-jump elements on the same frame. l

- According to the present invention, a drill cultivator is provided which includes a first frame supported by wheels, upon which frame a seed box is mounted. A second frame is adjustably supported onthe first frame in such a way that it may occupy any one of a number of parallel positions with respect to the first frame. There is also provideda lifting means actuated by the rotation of the wheels for raising the second frame to a fixed height from any one of a plurality of lowered positions. The second frame carries a number of cultivating elements, which may be either of the spring tooth type or of the stumpjump type. Seed tubes connect the seed box mounted on the first frame and some of the culti- -50 vating elements.

, Referring to the drawings-' v Figure 1' is a side elevation in section of the novel drill cultivator; g

v Figure 2 is an enlarged view, showing in detail 1- the arrangement by whichv parallel lift ofthe cultivator element to a constant height effected;

Figure 3 is a plan viewof the parts shown in Figure2; a

Figure 4 is a detail viewin plan, showing the (a way in which both springrtooth elements and stump-jump elements are attached to the frame of the. cultivator;

Figure 5 shows a side view of the mounting of a stump-jump element; and, I x Figure 6 is a similar view, showing the mounting of a spring tooth element. The cultivator of the present invention. has rear wheels I0, as well as front; wheels, notshown. A: frame .II is supported upon the rear wheels l0 1 and includes a plurality of transverse members I l2, l3 and, aswell as longitudinal members i 5. Beneath the frame It is a second frame I! (Figure 4), which is composed of a plurality of longitudinally extending niembers plurality of transverse. members l9, which extend between ,pairs of thelongitudinal members l8.

The frame vl'l is positioned beneath the frame I l and is carried thereby by means of a plurality of upstanding members 2| atthe' front end and upstanding members 22 at the rear end (Figure 1). At the front end of the frame H, there isa transverse rock-shaft 23, to which is .fixed a plurality of arms 24, connected in, turn tothe various upstanding members 2|, At the rear of the frame I I and slightly beneath it, a rock-shaft. 26 is carried, which has a plurality of arms 2! fixed thereto and connected to various upstanding members 22. A spring 28. is shown assurrounding each member ;22,,and the connection between themembers 22 and 21 is yielding so as to allow yielding movement of the rear of the frame; I8. A similar connection may be established between the members 2| and 24 to allow such a movement between the front of the frame, 4

ings 35 and 39', is journaled upon the shaft 33 d and meshes with a worm 35 secured to a crank 35 having awhandle 31. A shield 38 partially housesthe worm 35 andis supported by the bracket 32. A depending member Allis journaled upon .theshaft 33 and has. an 1 arcuate slot 42 I8 and a therein and a lug 43. A link 44 is connected at one end to one side of the gear segment 34 in the opening 39, and at the other end to one end of a link 45 in engagement with the slot 42. The other end of the link 45 is connected at 46 to the arm 29 secured to the rook-shaft 23.

A rod 4? is connected at one end to the member 48 at the lug portion 43 and at the other endto an eccentric member 48 journaled upon'a shaft 49, to which the rear wheels H] of the cultivator arefixed. In parallel spaced relation to the eccentric member 48 is a member 50 fixed to the shaft so as to rotate with it. Fixed to the mem-' ber 48 is a member 5| immediately adjacent the member 59. A pawl 52 is pivoted upon the member 5i and is under the action of a spring (not shown) so as to urge a roller 53 on the pawl into engagement with an internal grooved surface on the member 59. However, this is prevented by a lever 55, which is pivoted on the frame member 14 and is urged by a spring so as to be kept in contact with the end of the pawl 52. The apparatu's' just described is a power lift of a well known type. When it is desired to actuate the lift, the lever 55 is moved counter-clockwise, as viewed in Figure 2, so as to move same out of engagement with the pawl 52'. This causes the roller 53 to come into engagement with an inner surface of the member 59 continuously rotating because of its being secured to the shaft 49. Consequently the member 5! is caused to rotate and, with it, the eccentric 48, so as to'move the rod 4? either to the right or left. Movementof the rod 4'! causes a movement of the member 45 and consequent turning of the rock-shaft 23,

because of the connection with the member 40 through the link 45 and member 29. Thus, there is an angular movement of the members 24 and, with them, of the upstanding members 2 I, so that the frame ll is either raised or lowered. Because of the connection of the rock-shaft 26 with the rock-shaft 23 through the members 29 and 3| and link 59, the rock-shaft 26 rotates with the rock-shaft 23 and there is a raising or lowering of'the rear of the frame i'i along with the raising or lowering of the front. Consequently, there is a so-called parallel lifting of the frame 11. In other words, the frame I! in any one position is parallel to each other position that it may occupy. Adjustment for depth of the frame 11 is effected by a twisting of the crank 36, which, through the worm 35, effects an angular movement of the gear segment 34. The link 44 is moved with the gear segment 34 and causes the link 45 to move and swing the member 29 so as to rotate the shaft 23. Rotation of the shaft 23 effects the change in height of the frame ll. Corresponding rotation of the shaft 26 effects a like change in height of the rear of the frame l1.

With the arrangement of parts shown in Figure 2, namely, the gear segment 34, member 40 with the arcuate slot 42, the links 44 and 45 having'a point of connection which moves in the arcuate slot, and a power lift connection with the member 45 through the rod 41, there is a lifting of the frame l! to a fixed'height, regardless of the position from which it is lifted. This arrangement is more fully described in the patent to Robinson No. 1,846,457, dated February 23, 1932.

Briefly, the theory of operation is as follows: Whenthe cultivating elements are in lifted position, the lifting mechanism. is as shown in Figure 2. The member 45 is always in the same position, since the power lift always moves the rod 41 the same amount. In this position, the point 46 is located at the center of, the arc of the slot 42. Thus, regardless of the position of the ends of rods 44 and 45 in slot 42 because of the adjustment for depth, point46 occupies a fixed position, and consequently the lifted position of the cultivating elements is the same.

As previously stated, the frame I! is lifted in such a manner that the front and rear lift the same amounts. Means for guiding the lifting of the frame I! with respect to the fixed frame H is provided in the form of V-shaped members 58 extending in parallel, spaced relation below the frame ll. These members 58 extend between closely spaced pairs of longitudinal members 18 of the frame I! and between outside members l8 and straps 59 secured thereto. There is a single roller 60 between each pair of members l8 and pairs of rollers 59 between the outside members l8 and straps 59, which serve as guides for the members 58. Because the members 58 are spaced transversely of the frame I land fit fairly snugly between the closely spaced members I8, there can be no transverse movement of the frame I! with respect to the frame I I, regardless of the height of the frame ll. Because the rollers 60 engage the members 58, there can be no longitudinal movement of the frame I! with respect to the frame ll.

Figures 4 and 5 show the way in which stumpjump cultivating elements 6! are secured to the frame. I]. A pair of members 52 is secured to the adjacent transverse members [9 by means of U-bolts 63. A particular stump-jump element 6| extends across the front transverse member l9 and is pivoted at 64 between the members 62. At the very end of the element 6 I is connected a long toggle link 65, to which, in turn, is connected a' short toggle link 65, which is connected to a supporting 'member 6'! carried between the members 62. The head of a bolt 68 is pivotally secured at a mid-point of the link 66 and extends through the support 61. There is a spring 69 surrounding the bolt 68, and a nut 10 on the end of the bolt holds the spring against the support 67. In operation of the stump-jump element 61, the lower end thereof is in engagement with the ground. When an obstruction is encountered, which exerts upon the tooth a force beyond a predetermined amount, the tooth swings in a counter-clockwise direction about the point 64 and pulls the toggle elements 65 and 66 out of the position shown in Figure 5. When the obstruction is passed, the force of the spring 69 causes the tooth to be returned to its original position.

Figure 6 shows a spring toothelement 12 securedupon the transverse member E9. The upper end of the tooth 12 extends across the transverse member i 9 and is held thereagainst by means ofa reenforcing member i3 and a U -bolt member 14, adjusted by means of a set screw 15.

It will be seen that, because of the structure described for connecting both the stmnp-jump element SI and the spring tooth element 12, either type of elementmay be connected to the same frame.

As will be seen from Figure 1, some of the cultivating elements have seed boots 16 attached to them with seed tubes H extending from spouts 18 on the under side of a see-d box 79 carried by the frame H.

Operation of the drill cultivator is as has been described. Figure 1 shows the frame I! in lifted transport position. A pull upon the lever 55 I8 including longitudinal members and transverse action of the seed drill in combination with the cultivating elements is well known and need not be described other than to say that seed is allowed to drop through the spouts l8 and tubes T! and the seed boot I6 into the groundas the.

ground is being cultivated by the various elements. a i

The rod 36 extendsto the rear of the cultivator in Figure 1. An operator stands at the rear of the cultivator controlling the rod from this point. The cultivator is operated thus when horse drawn. When it is tractor drawn, the unit comprising rod 36, worm 35, shield 38, and gear segment is removed fromshaft 33 and turned around so that rod 36 extends to within reach of a tractor operator. In this position link 44 is connected in opening 39' in gear segment 39.

It will be apparent from the foregoing that a novel drill cultivator has been provided, on which there is means for parallel lifting of the cultivating elements to a constant height from any one of a plurality of lower positions. Along with this there is a novel construction by which either stump-jump elements or, spring tooth elements are attached tothe same framework.

The intention is tolimit the invention only by the terms of the appended claims.

What is claimed is:

1. A cultivator comprising a support, a frame members to which spring tooth elements may be secured, pairs of closely spaced members secured to adjacent transverse members, elements pivotally mounted on the pairs of closely spaced members, mechanisms connecting the elements a and pairs of members for allowing the elements to swing upon a predetermined pressure against the ground-engaging portions of the elements,

seed boots connecting the seed box and some of the elements, and means for adjusting the frame to a plurality of parallel positions at different heights with respect to the support.

,2. A cultivator comprising, a support, a frame including longitudinal members and transverse members to which spring tooth elements may be secured, pairs of closely spaced members secured to adjacent transverse members, elements pivotally mounted on the pairs of closely spaced members, mechanisms connecting the elements and pairs of members for'allowing the elements to swing upon a predetermined pressure against back of the support, connections therewith and with the front and back of the frame, links connecting the rock-shafts, a gear segment pivotally mounted on the support and connected with one rock-shaft, and a worm gear also mounted thereon and meshing with the gear segment.

FRANK THOMPSON. 

